Is jealously attractive?

I've often whether people find it nice if their partner/crush gets a bit jealous if they see someone else of the opposite sex. I've always found it rather flattering when guys have got jealous about me seeing other males, but wondered whether this can sometimes put people off?

Jealously has no place in a relationship. A relationship should be built on trust and happiness.

yeah but the thing is, it seems expected that the second you enter into a relationship with someone, you trust them implicitly. That is not always the case. Trust, to me, has to be earned; i don't give it to people by default.

I think there are a few different types of jealousy; one type stems from mis-trust and devaluing your partner's integrity, assuming they will act like a prick the first chance they get. I would suggest that's not healthy.

Another type stems from personal insecurity and/or believing your partner to be so amazing that they deserve only the best and believing you are not the best and therefore thinking they could be doing better. That can develop into clingyness and other unattractive qualities, but a little bit in moderation isn't too bad and is perfectly natural.